Troubleshooting the Nighthawk Router Blinking Red Error.

The Nighthawk router blinking red light indicates the firmware of the router is corrupted. This issue arises when you have interrupted the firmware update of the router.
Also, this issue could occur when you have downloaded the incorrect firmware file. In this case, you need to reset the Nighthawk router to fix the firmware issues within the router. After the reset, the issues within the router should be gone.

https://nighthawklog.net/how-t....o-fix-nighthawk-rout

Eero Flashing White Light? Here's the Fix
The Eero flashing white light indicates the device is connecting to the internet. When the eero has a stable WiFi connection, the white blinking light will stabilize.
So, when the Eero is having trouble connecting to the internet, you must fix the issue. Check the power source of the device and ensure it’s proper. You can try power cycling or resetting the device to resolve the issues. Then, the device should connect to the WiFi easily.

https://wirelessboosterax.com/....how-to-fix-eero-blin